Journals / Mikrobiyoloji Bülteni / 2007 / Cilt: 41 - Sayı: 3

Investigation of phenotypic and genotypic characteristics of vancomycin-resistant Enterococcus faecium isolates

Vankomisine dirençli Enterococcus faecium suşlarının fenotipik ve genotipik olarak incelenmesi

Pages
347–356
DOI
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AI Summary & Key Takeaways

AI Insight
⚡ TL;DR(Too Long; Didn't Read)

According to these results, the spread of VRE within our hospital was considered as a polyclonal dissemination.

📌 3 Key Takeaways

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Objective & Hypothesis:The purpose of the present study was to investigate the phenotypic and genotypic characteristics and the probable clonal dissemination of 13 vancomycin- resistant enterococcus (VRE) strains isolated between February-August 2006- from 11 patients at the Hospital of Istanbul Faculty of Medicine.
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Key Findings & Data:Molecular investigation by RAPD-PCR showed these strains to belong to four different patterns, each containing 1 to 5 isolates.
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Conclusion & Impact:According to these results, the spread of VRE within our hospital was considered as a polyclonal dissemination.
🔬Design:Research Article
📍Scope:2006 Verileri
⚙️Variables:Genotip · Mikrobiyal duyarlılık testleri · Enterococcus faecium

Abstract

The purpose of the present study was to investigate the phenotypic and genotypic characteristics and the probable clonal dissemination of 13 vancomycin- resistant enterococcus (VRE) strains isolated between February-August 2006- from 11 patients at the Hospital of Istanbul Faculty of Medicine. The in vitro activities of antibiotics were determined by disk diffusion method in accordance with the CLSI (Clinical and Laboratory Standards Institute) guidelines and the minimum inhibitory concentration (MIC) values by E-test. Multiplex polymerase chain reaction (PCR) was performed for detection of vanA, vanB and yanC genes and RAPD-PCR (Randomly amplified polymorphic DNA-PCR) for investigating a clonal relationship among the isolates. All isolates exhibited resistance to vancomycin, teicoplanin, ampicillin, and high-level resistance to streptomycin. VanA phenotype and the relevant vanA gene, characterised by resistance to both vancomycin and teicoplanin, were detected in allisolates which were all E.faecium. Molecular investigation by RAPD-PCR showed these strains to belong to four different patterns, each containing 1 to 5 isolates. According to these results, the spread of VRE within our hospital was considered as a polyclonal dissemination.

Özet

Bu çalışmada, İstanbul Tıp Fakültesi Hastanesi'nde Şubat-Ağustos 2006 tarihleri arasında 11 hastadan izole edilen toplam 13 vankomisine dirençli enterokok (VRE) susunun fenotipik ve genotipik özelliklerinin ve klonal yayılım olasılığının incelenmesi amaçlanmıştır. Antibiyotiklerin in vitro aktiviteleri CLSI (Clinical and Laboratory Standards Institute) önerilerine göre disk difüzyon yöntemi ile araştırılmış ve minimum inhibisyon konsantrasyon (MİK) değerleri E-test yöntemiyle belirlenmiştir. vanA, vanB ve vanC genlerinin saptanması için multipleks polimeraz zincir reaksiyonu (PCR) yöntemi uygulanmış, VRE suşları arasındaki klonal ilişki RAPD-PCR (Randomly amplified polymorphic DNA-PCR) yöntemi ile araştırılmıştır. Bütün izolatlar vankomisin, teikoplanin ve ampisiline dirençli, streptomisine yüksek düzey dirençli olarak saptanmıştır. Tüm suşların hem vankomisine hem teikoplanine direnç ile karakterize olan VanA fenotipine ve vanA genine sahip E.faecium izolatları olduğu gösterilmiştir. RAPD-PCR yöntemi ile, her bir gruptaki suş sayısının 1-5 arasında değiştiği dört farklı patern saptanmıştır. Bu sonuçlara göre hastanemizde bulunan VRE suşlarının birden fazla klondan köken aldığı düşünülmektedir.

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Cite This Article

AKTAŞ, Z., DİYARBAKIRLI, P., BAL, Ç., GÜRLER, N., KESER, M., SOMER, A., SALMAN, N. (2007). Investigation of phenotypic and genotypic characteristics of vancomycin-resistant Enterococcus faecium isolates. Mikrobiyoloji Bülteni, Cilt: 41 - Sayı: 3, 347–356. https://ajindex.com/articles/299027

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